ORCID Profile
0000-0001-9625-9866
Current Organisations
North China Electric Power University
,
Shandong University
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Springer Nature Singapore
Date: 2022
Publisher: Springer Nature Singapore
Date: 2022
Publisher: Springer Nature Singapore
Date: 2022
Publisher: Springer Nature Singapore
Date: 2022
Publisher: Springer Nature Singapore
Date: 2022
Publisher: ASME International
Date: 28-03-2017
DOI: 10.1115/1.4035920
Abstract: Supercritical CO2 (sCO2) cycles are considered as a promising technology for next generation concentrated solar thermal, waste heat recovery, and nuclear applications. Particularly at small scale, where radial inflow turbines can be employed, using sCO2 results in both system advantages and simplifications of the turbine design, leading to improved performance and cost reductions. This paper aims to provide new insight toward the design of radial turbines for operation with sCO2 in the 100–200 kW range. The quasi-one-dimensional mean-line design code topgen is enhanced to explore and map the radial turbine design space. This mapping process over a state space defined by head and flow coefficients allows the selection of an optimum turbine design, while balancing performance and geometrical constraints. By considering three operating points with varying power levels and rotor speeds, the effect of these on feasible design space and performance is explored. This provides new insight toward the key geometric features and operational constraints that limit the design space as well as scaling effects. Finally, review of the loss break-down of the designs elucidates the importance of the respective loss mechanisms. Similarly, it allows the identification of design directions that lead to improved performance. Overall, this work has shown that turbine design with efficiencies in the range of 78–82% is possible in this power range and provides insight into the design space that allows the selection of optimum designs.
Publisher: Springer Nature Singapore
Date: 2022
Publisher: Springer Nature Singapore
Date: 2022
Publisher: Springer Nature Singapore
Date: 2022
Publisher: American Society of Mechanical Engineers
Date: 13-06-2016
DOI: 10.1115/GT2016-58137
Abstract: Supercritical CO2 (sCO2) radial inflow turbine are an enabling technology for small scale concentrated solar thermal power. They are a research direction of the Australian Solar Thermal Research Initiative (ASTRI). This study uses the 1D meanline design code TOPGEN, to explore the radial turbine design space under consideration of sCO2 real gas properties. TOPGEN maps a parametric design space defined by flow and head coefficient. The preliminary design code is used explore the feasibility, geometry and performance of sCO2 turbines in the 100kW to 200kW range in order to assess feasible design spaces and to investigate turbine scaling. Turbines are scaled with respect to power, while maintaining specific speed constant and with respect to speed. This analysis shows that both scaling approaches change the feasible design space and that both geometric constraints such as blade height or operational constraints such as blade natural frequency can significantly limit the design space. Detailed analysis of four shortlisted designs shows that turbine efficiencies close to 85% can be attained for 100kW and 200kW output powers, even when operating at reduced rotor speeds. This work provides new insight towards the design of small scale radial turbines for operation with sCO2 and highlights scaling issues that may arise when testing sub-scale turbine prototypes.
Publisher: University of Queensland Library
Date: 2019
Publisher: Springer Science and Business Media LLC
Date: 08-10-2019
Publisher: Elsevier BV
Date: 02-2023
Publisher: Informa UK Limited
Date: 25-11-2022
Publisher: Informa UK Limited
Date: 12-01-2022
Publisher: Elsevier BV
Date: 11-2019
Publisher: Springer Nature Singapore
Date: 2022
Publisher: Springer Science and Business Media LLC
Date: 12-08-2019
Publisher: American Chemical Society (ACS)
Date: 06-08-2020
Publisher: Elsevier BV
Date: 05-2016
Publisher: Informa UK Limited
Date: 26-12-2021
Publisher: Springer Science and Business Media LLC
Date: 21-11-2019
DOI: 10.1038/S41598-019-53869-W
Abstract: It is generally acknowledged that the activation method and component of the precursor are of great importance for making porous carbon. In this study, four plant materials belong to one genus were selected as optimized plant material to produce hierarchical porous carbon for supercapacitors, the influence of initial structure was discussed. All the produced porous carbons have large specific surface area (higher than 2342 m 2 g −1 ), high microporosity (more than 57%), and high pore volume (larger than 1.32 cm 3 g −1 ). All the s les show characteristic of electrical double layer capacitance, and the onion-based porous carbon obtain highest specific capacitance of 568 F g −1 at the current density of 0.1 A g −1 . With the current density rising from 1 A g −1 to 50 A g −1 , the specific capacitance only decreases for 20%. After 5000 cycles, all the s les show relatively high capacitance retention (up to 97%). Two-step acid pickling has washed most impurities and directly lead to small equivalent series resistance (lower than 0.2 Ω). The s les show high power density and energy density (71 W h kg −1 @180 W kg −1 , 210 kW kg −1 @33 W h kg −1 ). This study open an avenue to create high-performance hierarchical porous carbon based on plant architecture.
Publisher: Elsevier BV
Date: 03-2023
Publisher: Elsevier BV
Date: 07-2017
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 06-2018
Publisher: Elsevier BV
Date: 08-2020
Publisher: MDPI AG
Date: 06-05-2021
DOI: 10.3390/EN14092655
Abstract: The influence of the briquetting process on SO2 and NO release characteristics, combustion properties and kinetic characteristics during biomass combustion was investigated. Two biomass (Wheat straw and Tree bulk) and two obtained briquettes were analysed. The briquetting process helps to prevent the release of SO2 and NO. The experimental results show that once the biomass is made into a briquette, when the reaction temperature is 900 ∘C, the sulphur release ratio for TB was reduced from 34.7% to 4.3% and for WS was reduced from 12.4% to 1.6%. When the reaction temperature increases to 1000 ∘C, the sulphur release ratio for TB was reduced from 73.4% to 30.4%, for WS it was reduced from 58.4% to 10.2%. SEM micrographs show that the compact structure of the TB-Briquette and WS-Briquette reduce the rate of SO2 and NO release during combustion. The thermogravimetry confirmed that the combustion performance of WS-Briquette is the best, while the TB-Briquette is the worst. According to the Coats-Redfern method, the fitting was performed at segments of 250 ∘C to 550 ∘C, and the correlation coefficient of the fitting degree was above 0.99. The effective collision rate of WS-Briquette is much higher than that of other briquettes. Compared to BR-1 and BR-2, trying to mix TB with WS to make a compound biomass briquette can enhance the combustion performance of TB-Briquette. The results may guide the upgrading of biomass briquettes technology and benefit the efficient application of biomass briquettes.
No related grants have been discovered for Jianhui Qi.